Pedestal construction for loud-speakers and the like



April 2, 1929.

C. L. FARRAND ET AL PEDESTALCONSTRUCTION FOR LOUD SPEAKERS AND THE LIKE Filed Ncv. 5, 1926 2 INVENTORS 4 Z1 Patented Apr. 2f, 1929..

umreo STATES v time PM FFHCE.

CLAIR L. FARRAND, FOREST HILLS, NEW YORK, AND ERNEST ROSS, OF EAST ORANGE, NEW JERSEY; SAID ROSS .ASSIGNOR TO FARRAND MFG. CO. INC., 0]? LONG ISLAND CITY, NEW YORK, A CORPORATION OF NEW JERSEY.

PEDESTAL CONSTRUCTION FOR LOUD-SPEAKERS AND THE L"? Application filed November 5, 1926. Serial Ho. 146,358.

This invention relates to the construction of pedestals or bases for supporting various devices such for instance as the diaphragm and electromagnetic actuating mechanism of radio loud speakers.

While the improved pedestal construction to be hereinafter described may be used in various relations, it was designed especially for use as a base for radio loud speakers and this application of the invention-will therefore be specifically described as an llustration of one of the uses of the inventron.

Oneobjectof the invention is to prov de a pedestal construction which is inexpensive to manufacture and neat in appearance.

Another object is to provide an improved pedestal or base for radio loud speakers.

' The invention has for an additional ob ect the provision of a pedestal or a supporting base having cushioning means such as felt associated with its lower surface m an imroved manner.

A radio loud speaker having a supporting base constructed in accordancev with the L111- vention is illustrated in the accompanymg drawings in which Fig. 1 is a side elevation of the loud speaker;

Fig. 2 is a bottom plan view of the supporting base;

Fig. 3 is a vertical section taken onthe line 33ofFig,l,and i a Fig. 4 is a detail broken perspective view showing the shape of the strip of felt used in the supporting base. 1

The loud speaker illustrated in the draw ing is of that type ordinarily known as a double cone speaker, but the invention is applicable to any type of loud speaker and in fact structure which comprises inner and outerclamping rings 4 and 5 the detail construction of which is immaterial so far as the present invention is concerned. The ring struc- 8 which pass downwardly through an open-- V illustrated in the drawings the lower ends of .the rods 8 are reduced in diameter and are threaded as shown at 16. The bottom of the to any other device which it is desired to sheet metal member 20 is ture is supported at 6 and 7 on a pairof rods ing 9 in the lowermost portion of the cone structure and are secured at their lower ends to the base or pedestal which forms the subject matter of the present invention. The rods 8 also serve to support an electromagnetic actuating device 10 having an actuating rod 11 connected to the apex of the cone 1.

The pedestal or supporting base comprises an upper sheet metal stamping 12 which may have any suitable configuration to give the base an ornamental appearance. The sheet metal member 12 supports a casting 13 which is provided with two upstanding lips or projections 14 and 15 forming between them a pocket for receiving the lower edge portion of the cone structure. The lips 14 and 15 also serve to conceal the opening 9 formed in the lower part of the diaphragm structure. In the particular embodiment of the invention casting-13. as well as the adjoining part of the sheet metal member 12 are provided with openings to receive the threaded portions 16 o the rods 8; A pair of nuts 17 threaded on to the reduced end portion 16 of the rods 8 serve to clamp the sheet metal member 12 and the casting 13 againstthe shoulders 18 on the rods which are formed as a result of reducing the diameter of the lower ends of therods. The sheet metal member 12 has a peripheral flange 19 of ornamental configuration as shown in Fig. 2. A sheet metal bottom member 20 has a similar flange 21 of the same general configuration as the flange 19, but the flange 21 is so located that when the bottom member 20 is in place the'flanges 19 and 21 form between them a continuous 95 groove or recess. The sheet metal bottom member 20 is provided with a pair of 0 enings to receive the extreme lower ends oi the rods 18 and a pair of nuts 22 serve to hold the bottom member in lace. Before the sheet metal bottom mem er is positioneda strip of felt or similar cushioning material 23 is positioned against the flange 19 of the upper sheet metal member 12. This strip of felt is of such width that when the bottom ositioned in place of felt will be tightly clamped bee flanges 19 and 21. The vertical the strip tween t height of the strip of felt is such that it will project slightly below the lower edges of the flanges 19 and 21 as shown in Fig. 3 so that no metal part of the base will come in con tact with the surface on which the base is supported. The lower face of the strip of felt 23 constitutes a soft cushion surface on which the entire device is supported. The strip of felt therefore performs its function of protecting the supporting surface just as well as if the entire lower face of the pedestal were covered with felt. Heretofore, especially in loud speaker construction, it has been customary to secure a flat piece of felt to the horizontal lower face of the base by means of ad hesive or the like, but the construction herein described is less expensive and more eflicient. N o adhesive is necessary as the strip'of felt is mechanically clamped between the flanges of the two sheet metal members of the base; Furthermore, the amount of felt that is required to form the soft cushion supporting surface is reduced to a minimum. The base may be quickly and readily assembled as it is only necessary to insert the lower member 20 in the sheet metal member 12 and to clamp the two together with the strip of felt located between their peripheral flanges.

As stated above a base of this construction may be used for supporting various devices. The rods 8 may be used as intermediate means for supporting the device on the base or if desired the device to be supported ma be attached directly to the base without the interposition of the rods 8 in which case the sheet metal members 12 and 20 may be clam ed together by bolts and nuts of the usua construction. In fact the lower. ends of the rods 8 when constructed as shown in the drawings are nothing more than ordinary bolts which are continued upwardly to form the rods 8. The casting 13 may also be omitted or changed to suit circumstances when the base isused for purposes other than that herein disclose As the base shown in the drawings was designed for use on a radio loud speaker the bottom of the casting 13 is provided with an opening 24 and the adjoining portion of the sheet metal member 12 is provided with a corresponding opening 25 through which the electric wires from the electromagnetic actuating mechanism may pass into the base. The rear wall of the sheet metal member 12 is provided with another opening 26 through which the electric wires may pass from the interior of the base to its. exterior as shown at 27 in Fig. 1.

The members 12 and 20 may be made of any suitable metal, and instead of stamping them as above described they may be cast if so dey duced diameter and engaging the lower surface of the bottom member to clamp the two members to said rod, an integral portion of said rod extending upwardly from the base to the point where the loud speaker is supported.

' In testimony whereof we affix our signatures.

CLAIR L. *FARRAND. ERNEST ROSS. 

